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LOAD DATA FOR  FN  BULLETS

Large calibres from .338" / 8.58mm

See the Technical Data page for assistance with the correct choice of bullet and for BC values.

Read the following notes before going to the load data table below.

Cartridge: If your cartridge is not listed, please email us for assistance.

Bullet: Bullet numbers consist of the caliber (first three digits) the weight in gr (next three digits) the bullet type (two letters) and the part number (three digits). Bullets in green are the preferred bullets for general use in standard calibers.

Twist: The twist is indicated as one rotation in the number of inches shown. This is a minimum number. When a bullet is indicated for a twist rate, it can also be used in faster twist rates (smaller numbers), but not in slower twist rates (bigger numbers). See the Technical Data page for more information about the correct bullet choice.

Powder: Listed powders are chosen to give a combination of the best case fill, most complete burn in a 24"barrel and lowest muzzle pressure. If a powder is not listed, the powder on the list gives better performance or the unlisted powder is new and has not been tested.

Start gr: The indicated start load in grains is a safe load in our experience. It may give maximum speed in some rifles and can be reduced if needed. It is not a minimum load and it is not supposed to give the speed as shown in the MAX FPS column.

MAX FPS: This is the speed at which maximum allowed pressure is likely to occur in a 24" barrel. It is not the recommended speed. Adjust the number by the amount given in the FPS/Inch column for barrels longer or shorter than 24". Do not exceed the adjusted MAX FPS number. Whatever charge is required to reach the MAX FPS (P/Max ) is the maximum charge for that rifle. We recommend 50fps to 100fps under maximum as a good general load.

FPS/Inch: This is the speed change that is probable for barrels longer or shorter than 24" with the indicated powder.
Add or subtract the value in this column for every inch the barrel is longer or shorter than 24".  All load data is configured for 24" barrels except where it is stated otherwise.

Case Fill: Is approximately how much the charge will fill the case. Compressed charges up to 105% are not unusual. Full cases give better accuracy and more consistent speeds.  Compression is not bad, providing it does not cause mechanical problems such as COL changes or case bulging that prevents chambering. This is a guide line only and the numbers may vary depending on the make of the case and the capacity. If this column contains CC, case capacity will probably be the limiting factor rather than MAX FPS.

Burn: Is the percentage of powder that will burn in a 24" barrel. Accuracy is improved with a more complete burn.

M/PSI: Is the approximate muzzle pressure at MAX FPS. This is an indication of what the recoil will be. With the same bullet and rifle, lower muzzle pressure will have less recoil.

Load Data for Large calibres from .338" / 8.58mm
Go to Small Calibres / Medium Calibres

Have you read the notes above?  If not, do so before using this load data table.

Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch %Fill Burn M/PSI
340 Weatherby Magnum 338250FN085 10 ADI AR 2209 77 2875 28 103 100 12490
      H 4350 73 2875 27 98 100 11877
      Rel 22 81 2925 29 107 100 13240
      Norma MRP 82 2950 29 105 100 13406
      S365 75 2850 26 100 100 11260
      Viht N560 82 2950 30 106 99 13818
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
338 Lapua Magnum 338250FN085                
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
9.3x62 366260FN051 14 ADI AR 2208 59 2600 22 104 100 7759
      R/Shot BigGame 64 2700 22 CC 100 8285
      IMR 4895 58 2675 21 103 100 7723
      Norma 203B 60 2675 21 103 100 7672
      S355 61 2650 21 107 100 7913
      Viht N530 55 2625 21 95 100 7510
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
375 Holland & Holland 375270FN050 15 ADI AR 2208 69 2750 23 100 100 8789
P/Max = 62366psi     Ramshot BigGame 74 2825 24 104 100 9303
      Rel - 15 69 2800 23 98 100 9136
      IMR 4895 68 2800 23 99 100 8677
      S355 71 2775 24 102 100 8866
      Norma 203B 70 2800 23 98 100 9072
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI

376 Steyr

                 
P/Max =                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
375 Ruger 375270FN050 15              
P/Max = 63817                  
                   
      S365 80 2800 22 CC 100 8766
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
378 Weatherby Magnum 375300FN136                
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
450/400 N.E. 3"

410380FN107

15 ADI AR2209 79 2250 23      
      Accurate 4350 78 2300 23      
      H4350 76 2300 23      
      Norma URP 76 2300 22      
      S365 79 2300 22      
      Viht N550 76 2300 23      
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
                   
                   
                   
416 Rigby Magnum 416380FN053 16.5 0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
      S365 95 2550 24 99 100 9429
      0 0 0 0 0 0 0
      0 0 0 0 0 0 0
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI

416 Rem Mag

416380FN053 16.5 ADI AR 2208 73 2500 19 103 100 7661
      IMR 4895 72 2550 19 103 100 7558
      Rel 15 74 2550 20 102 100 7986
      Norma 203B 75 2550 17 102 100 7930
      R/Shot BigGame 79 2575 21 CC 100 8134
      S355 76 2525 19 106 100 7756
      Viht N550 82 2575 24 109cc 100 8579
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
10.75x68 423387FN105 16.5 ADI AR 2208 57 2150 17      
      Rel 15 58 2175 17      
      IMR 3031 55 2175 15      
      Norma 203B 58 2175 17      
      Win 748 59 2200 16      
      S321 57 2175 16      
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
404 Jeffery (10.75x73) 423387FN105   ADI AR 2208 74 2400 20 98 100 7434
      IMR4895 73 2425 20 97 100 7383
      R/Shot BigGame 80 2450 21 102 100 7957
      S355 77 2425 20 100 100 7580
      Viht N550 84 2475 22 103 100 8353
      Norma 203B 76 2425 21 97 100 7736
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
444 Marlin 444225FN263 36              
P/Max = 51488psi                  
                   
      S265 41 2500 16 101 100 3379
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
450 Marlin 458300FN133 36              
                   
                   
      S265 43 2300 15 98 100 3241
                   
                   
  458350FN125 28              
                   
                   
      S265 37 2050 12 97 100 2807
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
45-70 Gov. 17000psi 456305FN147                
45-70 Gov. 28000psi                  
                   
45-70 Gov. 40000psi                  
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
458 Win Mag 458400FN115 22 ADI AR 2219 72 2525 18 100 100 6016
      Ramshot TAC 77 2550 19 104 100 6500
      H355 76 2550 18 100 100 6258
      Norma 201 76 2550 19 CC 100 6095
      S321 78 2550 19 105 99 6550
      Viht N130 68 2450 16 106 100 5305
458 Win Mag 458450FN049 18.5  Ramshot X-Term. 67 2325 16 98 100 5450
      IMR4198 58 2250 14 102 100 4655
      ADI AR2210 66 2300 16 100 100 5453
      S321 73 2350 17 105 100 5815
      W748 72 2350 18 105 100 5960
      Norma 201 70 2325 17 107 100 5808
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
458 Lott 458450FN049  20 ADI AR 2210 75 2375 17 95 100 6107
P/Max = 62366psi     A2520 82 2450 17 105 100 6456
      H322 73 2400 16 100 100 6057
      S321 81 2425 18 100 100 6630
      Norma 202 78 2400 17 105 100 6280
      Viht 76 2425 18 100 100 6487
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
450 Rigby 458450FN049  20              
P/Max = 58015psi                  
                   
      S355 97 2500  21  101 100 8105
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch % Fill Burn M/PSI
                   
P/Max =                   
                   
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
460 Weatherby 458500FN089                
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
470 NE 470500FN075                
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
505 Gibbs 505540FN099                
                   
                   
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
500 Jeffery 510500FN076 20 ADI AR2208 116 2500 23 94 99 7967
P/Max = 46412psi     Ramshot Big Game 125 2550 24 98 99 8572
      Accurate 2495 112 2500 22 93 100 7598
      Rel 15 117 2500 24 92 99 8362
      S355 110 2425 21 89 100 6918
      VV N550 130 2550 25 99 98 8934
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
500 Nitro Express 3" 510540FN101                
                   
Cartridge Bullet Twist Powder Start gr MAX FPS

FPS/Inch

% Fill Burn M/PSI
577 Tyrannosaur 580800FN138                
                   
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch %Fill Burn M/PSI
600 Nitro Express 600750FN166 34 ADI AR 2219 115 2150 19 79 99 5822
      A 2495 125 2200 20 94 100 6282
      IMR 3031 123 2200   92 100 6197
      H322 115 2150 19 84 99 5822
      S335 122 2100 18 87 99 5516
      Viht N135 126 2175 19 98 100 5826
Cartridge Bullet Twist Powder Start gr MAX FPS FPS/Inch %Fill Burn M/PSI
 

GS Custom Bullets, situated in Port Elizabeth on the East Coast of South Africa, manufactures solid copper, turned, monolithic hollow point bullets for hunting and sport shooting. These bullets are used by hunters on several continents, hunting from the smallest of antelope to the largest of dangerous game, using the smooth HP bullet, as well as the more popular HV, FN and SP bullets with the patented drive band concept. GSC bullets are configured for the highest possible ballistic coefficients. SP bullets are mainly used for sport shooting. All GS Custom Bullets are coated.